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synsacrum

[sin-sak-ruh m, -sey-kruh m] /sɪnˈsæk rəm, -ˈseɪ krəm/
noun, plural synsacra
[sin-sak-ruh, -sey-kruh] /sɪnˈsæk rə, -ˈseɪ krə/ (Show IPA).
Ornithology
1.
a dorsal ridge of bone in the pelvic region of birds, formed by the fusion of certain thoracic, lumbar, sacral, and caudal vertebrae.
Origin
1900-1905
1900-05; syn- + sacrum
Related forms
synsacral, adjective
presynsacral, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for synsacrum
  • In one twin, the synsacrum was absent as well as portions of the vertebral column.

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